Experimental study on dynamic thermal response of a passive solar cooling system

The dynamic thermal response of a passive solar cooling system under coastal climate in North China was investigated in this paper. Experiment was conducted in a passive solar house with an improved Trombe wall, which uses some measures to improve passive cooling effects, such the rolling blinds for shading and night ventilation for cooling storage. By continuous measuring, the dynamic responses of surface temperatures of building envelop and air temperatures with the change of outdoor climate are obtained; and the night cooling characteristics of the massive wall is studied based on the Frequency Domain Regression (FDR) method. The natural convection heat exchange between air in the gap of Trombe wall and indoor air is analyzed by Ra number. The study results indicate that surface temperature of solar collecting wall is not sensitive to solar radiation intensity with the help of rolling blinds, which can evidently restrain the indoor air overheat. The cooling effect of night ventilation on massive wall can last for the next daytime, which can weaken the overheat level. The indoor air temperature has obvious temperature gradients in both horizontal and vertical directions.